US4883444A - Coupling for transmitting a rotary motion - Google Patents

Coupling for transmitting a rotary motion Download PDF

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Publication number
US4883444A
US4883444A US07/191,587 US19158788A US4883444A US 4883444 A US4883444 A US 4883444A US 19158788 A US19158788 A US 19158788A US 4883444 A US4883444 A US 4883444A
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US
United States
Prior art keywords
coupling
driven shaft
clamping disk
ball
peripheral surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/191,587
Other languages
English (en)
Inventor
Ernst Strickler
Hansueli Wild
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mettler Toledo GmbH Germany
Original Assignee
Mettler Instrumente AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mettler Instrumente AG filed Critical Mettler Instrumente AG
Assigned to METTLER INSTRUMENTE AG, A SWISS CORP. reassignment METTLER INSTRUMENTE AG, A SWISS CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: STRICKLER, ERNST, WILD, HANSUELI
Application granted granted Critical
Publication of US4883444A publication Critical patent/US4883444A/en
Assigned to METTLER-TOLEDO AG reassignment METTLER-TOLEDO AG CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). JANUARY 1, 1990 Assignors: METTLER INSTRUMENTE AG
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G21/00—Details of weighing apparatus
    • G01G21/28—Frames, Housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D15/00—Clutches with wedging balls or rollers or with other wedgeable separate clutching members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D41/00—Freewheels or freewheel clutches
    • F16D41/06—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface
    • F16D41/08—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface with provision for altering the freewheeling action
    • F16D41/086—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface with provision for altering the freewheeling action the intermediate members being of circular cross-section and wedging by rolling
    • F16D41/088—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface with provision for altering the freewheeling action the intermediate members being of circular cross-section and wedging by rolling the intermediate members being of only one size and wedging by a movement not having an axial component, between inner and outer races, one of which is cylindrical

Definitions

  • the present invention relates to a coupling for transmitting a rotary motion in both directions of rotation.
  • the coupling includes a drive shaft and a driven shaft and a freewheeling capability in both directions of rotation for rotary motions introduced into the driven shaft.
  • one or more housing components are opened by sliding them by means of an electric drive in order to make the weighing dish accessible.
  • a rigid connection between the electric drive and the housing component to be opened is not desired because it must always be possible to manually operate the balance in certain types of applications.
  • a coupling of this general type in an analytical balance is disclosed in European patent application 0216035.
  • this coupling effects a frictional connection with the housing component.
  • one of the housing components is operated manually, the connection between the housing part and the drive motor is interrupted.
  • a rotor shaft with a friction wheel fastened on the rotor shaft is movably supported in a V-shaped guide slot in such a way that, when the drive motor is switched on, the rotor shaft of the drive motor rolls off in the guide slot and moves the friction wheel towards the surface of the housing component.
  • a clamping disk is placed on the drive shaft.
  • the clamping disk has at least one partial constriction or recess.
  • a circumferential surface is defined which is located essentially concentrically with the axis of rotation and is inclined relative to the horizontal.
  • At least one ball is placed on the circumferential surface.
  • a cage having an inwardly facing guide surface is placed on the end of the driven shaft. The cage encloses the clamping disk and the circumferential surface.
  • the coupling for transmitting a rotary motion in accordance with the present invention has the principal advantage that rotary motions or torques are transmitted by the coupling in one direction, i.e., from the input side to the output side in clockwise as well as counterclockwise direction, while rotary motions imparted to the output shaft of the coupling are not transmitted to the input shaft.
  • FIG. 1 is a sectional view in axial direction of a coupling according to the present invention
  • FIGS 2a-2c are transverse sectional views of the coupling of FIG. 1 taken along sectional line II--II showing the coupling in three different positions of operation;
  • FIG. 3 is a sectional view in axial direction of another embodiment of the coupling according to the present invention.
  • Coupling 1 has two rotatable shafts 3 and 5 which extend on a vertical axis A. Shaft 3 is connected to a drive motor, not shown. Driven shaft 5 is in connection with a slidable housing component of a balance, not shown.
  • a cage 7 is mounted on driven shaft 5 so as to rotate with driven shaft 5.
  • Cage 7 has an inwardly facing guide surface 9 which is essentially cylindrically-shaped.
  • a bearing 15 is placed on shaft 3.
  • Bearing 15 is seated in a sleeve 14 which is placed on a bottom 11 of a recess 13 of cage 7 or forms part of the recess 13.
  • a clamping disk 17 is mounted on drive shaft 3 so as to rotate with drive shaft 3.
  • the clamping disk 17 has a peripheral surface 19 which is partially provided with at least one restriction 21, as can be seen in FIG. 2.
  • FIGS. 2a-2c three constrictions 21 are provided. Of course, a different number of constrictions is also possible.
  • An annular plate 23 whose outer diameter is greater than the diameter of peripheral surface 19 is arranged underneath disk 17.
  • One or more grooves 25 are arranged in the plate 23.
  • the sides or circumferential surfaces 27 of the grooves 25 are inclined relative to the horizontal and extend to the periphery of plate 23.
  • Plate 23 is fixedly connected to shaft 3 through clamping disk 17.
  • One or more balls 29 are placed in each groove 25.
  • the number of balls 29 corresponds to the number of constrictions 21.
  • the balls 29 have a diameter d which is smaller than the greatest radial distance b and greater than the smallest radial distance c between the peripheral surface 19 of disk 17 and the guide surface 9.
  • the geometric shape of the peripheral surface 19 is composed preferably of logarithmic spiral portions, so that an always constant clamping angle is obtained independently of tolerances of the balls 29 and/or the guide surfaces 9. Of course, a different suitable shape can also be selected.
  • the centers of the balls 29 are located in the same plane as bearing 15.
  • FIGS. 2a-2c of the drawing show balls 29 in three different positions.
  • the balls 29 as seen in FIG. 2c are placed in constrictions 21 and are only in contact with disk 17. Thus, no connection exists between drive shaft 3 and driven shaft 5.
  • each ball 29 is also placed in motion. Due to the centrifugal force acting on the ball and the inertness of the ball 29 on the side 27, the ball 29 rolls outwardly and the disk 17 which rotates faster than the ball 29 causes the ball 29 to be clamped in the narrowing space between the guide surface 9 and the periphery 19 of disk 17. The flat clamping angle between the guide surface 9 and the periphery 19 results in a frictional engagement with cage 7, so that cage 7 and, thus, shaft 5 are rotated.
  • the symmetrical shape of the peripheral surface 19 of disk 17 makes possible a rotation of the cage 17 in the above-described manner in both directions of rotation.
  • each ball 29 rolls back on the inclined side 27 into the constriction 21 and the connection between the two shafts 3 and 5 is interrupted.
  • FIG. 3 differs from the embodiment shown in FIG. 1 in that the plate 23 including rolling surface 27 is not fixedly connected to disk 17. Rather, plate 23 stands still during operation. In ordr to achieve this, disk 17 forms part of a hollow supporting shaft 3. Hollow shaft 3 including disk 17 are mounted rotatably on a stationary shaft 31 which supports plate 23.
  • the cage 7 is placed in motion with delay because ball 29 is successively forced outwardly predominantly as a result of the rolling friction at the peripheral surface 19 of disk 17 until clamping and engagement at the guide surface 9 takes place.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Friction Gearing (AREA)
  • Centrifugal Separators (AREA)
  • One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
  • Transmission Devices (AREA)
  • Mechanical Operated Clutches (AREA)
US07/191,587 1987-06-02 1988-05-09 Coupling for transmitting a rotary motion Expired - Fee Related US4883444A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2092/87 1987-06-02
CH2092/87A CH673139A5 (de) 1987-06-02 1987-06-02

Publications (1)

Publication Number Publication Date
US4883444A true US4883444A (en) 1989-11-28

Family

ID=4225705

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/191,587 Expired - Fee Related US4883444A (en) 1987-06-02 1988-05-09 Coupling for transmitting a rotary motion

Country Status (5)

Country Link
US (1) US4883444A (de)
JP (1) JPH0720420Y2 (de)
CH (1) CH673139A5 (de)
DE (2) DE3816435A1 (de)
GB (1) GB2205617B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5099943A (en) * 1989-12-13 1992-03-31 Fiatgeotech - Tecnologie Per La Terra S.P.A. Device for engaging the four wheel drive transmission of a vehicle
US20050120832A1 (en) * 2003-12-05 2005-06-09 Chiang Shui L. Ratchet wrench
CN105829722A (zh) * 2013-12-19 2016-08-03 皮尔伯格泵技术有限责任公司 具有能切换的离合器的机动车真空泵
EP2674947A3 (de) * 2012-06-12 2017-01-11 Rolls-Royce plc Drehantrieb
US9919692B2 (en) 2013-12-19 2018-03-20 Pierburg Pump Technology Gmbh Motor vehicle assembly arrangement with an internal combustion engine and a switchable vacuum pump

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9494202B2 (en) 2013-07-25 2016-11-15 Toyota Jidosha Kabushiki Kaisha Clutch
GB201917151D0 (en) 2019-11-25 2020-01-08 Steeper Hugh Ltd An anti-back drive device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2720300A (en) * 1952-10-21 1955-10-11 Merz Werke Gebrueder Merz Centrifugal coupling devices
US3074227A (en) * 1958-02-21 1963-01-22 Toyo Rayon Co Ltd Spindle tip member for mounting a spool
US3388779A (en) * 1966-03-15 1968-06-18 Eaton Yale & Towne Drive differential with two-way overrunning clutch and temperature compensating operator
US4111288A (en) * 1976-12-30 1978-09-05 Borg-Warner Corporation Gear changing mechanism
US4438836A (en) * 1980-04-24 1984-03-27 Aisin Seiki Kabushiki Kaisha Freewheel hub assembly
US4620621A (en) * 1984-04-02 1986-11-04 Borg-Warner Corporation Centrifugally activated roller clutch/overrunning clutch

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2720300A (en) * 1952-10-21 1955-10-11 Merz Werke Gebrueder Merz Centrifugal coupling devices
US3074227A (en) * 1958-02-21 1963-01-22 Toyo Rayon Co Ltd Spindle tip member for mounting a spool
US3388779A (en) * 1966-03-15 1968-06-18 Eaton Yale & Towne Drive differential with two-way overrunning clutch and temperature compensating operator
US4111288A (en) * 1976-12-30 1978-09-05 Borg-Warner Corporation Gear changing mechanism
US4438836A (en) * 1980-04-24 1984-03-27 Aisin Seiki Kabushiki Kaisha Freewheel hub assembly
US4620621A (en) * 1984-04-02 1986-11-04 Borg-Warner Corporation Centrifugally activated roller clutch/overrunning clutch

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5099943A (en) * 1989-12-13 1992-03-31 Fiatgeotech - Tecnologie Per La Terra S.P.A. Device for engaging the four wheel drive transmission of a vehicle
US20050120832A1 (en) * 2003-12-05 2005-06-09 Chiang Shui L. Ratchet wrench
EP2674947A3 (de) * 2012-06-12 2017-01-11 Rolls-Royce plc Drehantrieb
CN105829722A (zh) * 2013-12-19 2016-08-03 皮尔伯格泵技术有限责任公司 具有能切换的离合器的机动车真空泵
CN105829722B (zh) * 2013-12-19 2017-12-12 皮尔伯格泵技术有限责任公司 具有能切换的离合器的机动车真空泵
US9919692B2 (en) 2013-12-19 2018-03-20 Pierburg Pump Technology Gmbh Motor vehicle assembly arrangement with an internal combustion engine and a switchable vacuum pump
US10161402B2 (en) 2013-12-19 2018-12-25 Pierburg Pump Technology Gmbh Motor vehicle vacuum pump having a switchable clutch

Also Published As

Publication number Publication date
GB8810485D0 (en) 1988-06-08
CH673139A5 (de) 1990-02-15
GB2205617B (en) 1990-10-24
GB2205617A (en) 1988-12-14
DE3816435A1 (de) 1988-12-15
JPH0720420Y2 (ja) 1995-05-15
DE8806352U1 (de) 1988-09-29
JPS63195131U (de) 1988-12-15

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Legal Events

Date Code Title Description
AS Assignment

Owner name: METTLER INSTRUMENTE AG, CH-8606 GREIFENSEE/SWITZER

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:STRICKLER, ERNST;WILD, HANSUELI;REEL/FRAME:004899/0608

Effective date: 19880426

Owner name: METTLER INSTRUMENTE AG, A SWISS CORP.,SWITZERLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:STRICKLER, ERNST;WILD, HANSUELI;REEL/FRAME:004899/0608

Effective date: 19880426

AS Assignment

Owner name: METTLER-TOLEDO AG

Free format text: CHANGE OF NAME;ASSIGNOR:METTLER INSTRUMENTE AG;REEL/FRAME:005593/0458

Effective date: 19900307

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Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

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Year of fee payment: 4

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Lapsed due to failure to pay maintenance fee

Effective date: 19971203

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362